java常量类的一种定义方式
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package cn.itcast.estore.util;public final class Constant {private Constant() {super();}/******************************* Common常量列表 *********************************//** * Common常量列表(存放公共的常量) ***/public static final class Common {private static final int INT_ZERO = 0;private static final int INT_ONE = 1;private static final String IDENTIFYING_CODE = "identifying_code";private static final String ENCODING_TYPE_UTF8 = "UTF-8";private static final String ENCODING_TYPE_ISO8895_1 = "ISO-8859-1";private static final String ENCODING_TYPE_GBK = "GBK";private static final String CONTENT_TYPE_TextHtml = "text/html";private static final String GET = "GET";private static final String POST = "POST";private static final String ENCRYPT_TYPE_MD5 = "md5";private static final String ENCRYPT_TYPE_SHA1 = "sha1";// 私有private Common() {super();}// 常量 "0"public static int INT_ZERO() {return INT_ZERO;}// 常量 "1"public static int INT_ONE() {return INT_ONE;}// 验证码常量名public static String IDENTIFYING_CODE() {return IDENTIFYING_CODE;}// utf8 编码类型public static String ENCODING_TYPE_UTF8() {return ENCODING_TYPE_UTF8;}// ISO-8859-1 编码类型public static String ENCODING_TYPE_ISO8895_1() {return ENCODING_TYPE_ISO8895_1;}// GBK 编码类型public static String ENCODING_TYPE_GBK() {return ENCODING_TYPE_GBK;}// 设置text/html 文本类型public static String CONTENT_TYPE_TextHtml() {return CONTENT_TYPE_TextHtml;}// GETpublic static String GET() {return GET;}// POSTpublic static String POST() {return POST;}// MD5public static String ENCRYPT_TYPE_MD5() {return ENCRYPT_TYPE_MD5;}// sha1public static String ENCRYPT_TYPE_SHA1() {return ENCRYPT_TYPE_SHA1;}}/*******************************User常量列表*********************************//** * User 存放和User类相关的常量 ***/public static final class User {private static final String USER_IN_SESSION = "user_in_session";private static final String USER_NAME = "username";// 私有private User() {super();}//public static String USER_IN_SESSION() {return USER_IN_SESSION;}//public static String USER_NAME() {return USER_NAME;}}}
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